The apparatus according to the present invention comprises a command voltage determination circuit section configured to determine a predetermined first compensation voltage as a command voltage upon initial startup and provide the command voltage to an inverter; a conversion circuit section configured to convert an output current of the inverter into a q-axis current on a synchronous reference frame; and a compensation voltage determination circuit section configured to determine a second compensation voltage based upon the q-axis current and to provide the second compensation voltage to the command voltage determination circuit section.